I was following this YouTube tutorial @5:27 where we can see that the object is full inside. But when I try to reproduce, it's hollow (1st and 2nd are mine, 3rd is tutorial screenshot)
Searching on google I see that being hollow is normal for Blender, but that doesn't explain how the tutorial author made it solid by default?
Boolean modifier is applied on Anvil (=cube), as Difference with the Cylinder. Also the author has version 2.78.5 while I have 2.82.